Question 1044437
You want to know each person's rate for how many Rs per day and this will be a simple unit conversion for each "person".  The "1-watch price"  is how many Rs for 1 watch or so many  {{{RS/WATCH}}}.


Here, r is for the one-watch repair price for person B.
<pre>
                 WATCHES/DAY       1-WATCH PRICE    Rs/DAY

PERSON A         15                (5/4)r           15*(5/4)r

PERSON B         18                 r               18*r
</pre>


<i>Person B earns  Rs.1088 per day.</i>
Can the value for r be found?
-
{{{(15*(5/4)r)*1=1088}}}, based on {{{PRICE*DAYS=REVENUE}}}.
Simply use multiplicative inverse of the left side, apply to both sides,
{{{r=1088(4/5)(1/15)}}}
{{{highlight(r=58.03)}}}


<i>What is daily income of person A?</i>
Recheck the data table, and that {{{18r}}} is the daily income for person A.  r is also now been found.
{{{18r=18*58.03}}}
{{{1044.48}}}
or better,
{{{highlight(1044*Rs)}}}